Lots of Pines mostly but a few Oaks as well.
I didn’t try to disrespect you in any way @SGL1. I asked you a question and you didn’t answer and you got a bit offended.
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Well, not anymore anyway. 
Misunderstanding and I tempered my response by deleting. Didn’t expect my deleted response to be print screened. I pw on the side yes but know enough to ask questions so I don’t make mistakes that cost me.
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Or that dark mulch and then it got left on there awhile. I know when people use that around their drives or walks and it spills over onto concrete and stays on it for a year or so, can be a real pita to clean.
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Reddish Orange dyed mulch is bad too. Had someone once asked me to wash a driveway that orange mulch uphill had stained most of the drive. Told them no way unless they got rid of the mulch first, cause next rain it’s staining it again.
That’s good to know but you can’t spot treat concrete with oxalic? I’ve had some concrete turn out splotchy with uneven applications before I started using a roller.
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That is a good point, I hate using oxalic because of mixing purposes. SH is definitely easier…but a very small acid mix takes care of the leaf stains.
Might even be something you could DS.
But if your post treating 3-4 % SH anyways these stains should dissapear
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Id say that looks that way because the vehicle is grinding them into driveway.
@SGL1 does the owner drive a truck? Looks like it could potentially be oil drips from truck or vehicle that drives over the same path day in day out and just, I know the spots are inline with tire marks but vehicles have under trays that could hold oil and drip over time every single day. If sh ain’t working even with pressure squirt some degreaser on a spot and see if the stains lightens up. Concrete is like a sponge even hot water won’t get it all off sometimes but try your luck.
With the patterns the way they are I’m thinking acorns but could be strange how they are blackish in color.
@SGL1 most likely are, just unsure of why they would stain. Never looked at an acorn as a stainer that seeps into concrete hmmmm
They definitely stain. Sh is a quick and easy fix. Hit it with 50/50
